* {
    margin: 0;
}

a {
    color: white;
    text-decoration: none;
}

.common {
    display: flex;
    justify-content: center;
}

.content {
    /*background-color: aqua;*/
    width: 1200px;
    height: 500px;
    /*border: 1px solid rebeccapurple;*/
}

.top {
    border: 1px solid rebeccapurple;
    background-image: url("../img/banner_qtah.jpg");
    height: 600px;
    /*width: 1920px;*/
    background-size: 100% 100%;
    /*    地址 ：绝对地址和相对地址*/
}

.top > div {
    /*border: 1px solid black;*/
}

{
/* 参数：1个  2  3  4 */
/*margin  */
/*padding*/
/*border*/
/*伪元素*/
}

/*--------------------头部----------------------------*/
.top {
    color: white;
}

.top > div {
    display: flex;
    justify-content: center;
}

.top > div > div {
    /*background-color: aqua;*/
    width: 1000px;
}

.top > div:first-child > div {
    display: flex;
    justify-content: space-between;
}

.phone {
    display: flex;
    align-items: center;
}

.phone > div {
    margin: 5px;
}

.top > div:first-child > div > div:first-child {
    height: 141px;
}

/*-------------------nav导航--------------------*/
.nav {
    background-color: rgb(230, 145, 55);
    height: 50px;
}

.nav > div {
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

.nav > div > div {
    height: 50px;
    padding: 0 20px;
    line-height: 50px;
}

/*鼠标移上去事件*/
.nav > div > div:hover {
    background-color: white;
    color: rgb(230, 145, 55);
    cursor: pointer;
}

/*-----------------------广告---------------------------------*/
.ad > div > div:nth-child(1) {
    padding: 30px 0 0 0;
    font-size: 50px;
}

.ad > div > div:nth-child(2) {
    line-height: 30px;
}

.ad > div > div:nth-child(3) > div {
    font-size: 40px;
    color: rgb(230, 145, 55);
}

.ad > div > div:nth-child(3) > div:nth-child(1) {
    display: flex;
    align-items: flex-end;
}

/*odd 奇数  even 偶数*/
.ad > div > div:nth-child(3) > div:nth-child(1) > div:nth-child(odd) {
    color: white;
    font-size: 30px;

}

.ad > div > div:nth-child(3) > div:nth-child(1) > div:nth-child(3) {
    /*margin: 0 0 0 20px;*/
    margin-left: 20px;
}

.ad > div > div:nth-child(3) > div:nth-child(2) {
    /*margin-left: 30px;*/
    text-indent: 1.5em;
}

/*----------------------------------------公共部分css-----------*/
.title {
    font-size: 30px;
    color: rgb(230, 145, 55);
    /*padding: 10px;*/
    border-bottom: 1px solid rebeccapurple;
}

.single-line-overflow {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}


.middle {
    display: flex;
    justify-content: center;
}

.middle > div {
    width: 1000px;
    margin: 50px 0;
}